يَا زَيْدُ! — “yā” is the vocative particle, “Zayd” the addressee.
أَيَا زَيْدُ! — “ayā” replaces the particle; the addressee remains Zayd.
These are teaching examples illustrating the particles enumerated in the source.
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Particle and Addressed Noun
Al-Munādā: Vocative Types and Rules
يَا زَيْدُ! — “yā” is the vocative particle, “Zayd” the addressee.
أَيَا زَيْدُ! — “ayā” replaces the particle; the addressee remains Zayd.
These are teaching examples illustrating the particles enumerated in the source.